Welcome to Pellet Fan!
Bummer, I don't know what I'd do if one of my freezers went out.
The 2000 watt Honda, depending on load. 9-12 hours. The big 6000, same thing, 6-8. The only thing we keep running in a blackout is both fridges and the freezer, and I dont even hook them up unless the power is out for more then 6 hours...
If I have a freezer, fridge, and regular kitchen fridge/freeezer unit (3 in total) running, what type of generator would you recommend to keep them all running?